Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

Stock-Based Compensation Plans [Abstract]

Stock-Based Award Plan Activity

A summary of the Company’s stock option (including SARs) activity for the years ended December 31, 2018, 2017 and 2016 is presented in the following table (underlying shares in thousands).

Stock-Based Compensation Awards						Wtd. Avg. Remaining Contractual Term (years)		Aggregate Intrisic Value of In-The-Money Options (in millions)
	Shares			Weighted-Average Exercise Price (per share)
Outstanding at December 31, 2015		17,033		$	8.36
Granted		2,427		$	10.75
Settled		(1,980	)	$	8.18
Forfeited		(2,931	)	$	8.31
Converted to liability		(1,264	)	$	8.16
Outstanding at December 31, 2016		13,285		$	8.85
Granted		799		$	20.00
Settled		(193	)	$	8.17
Forfeited		(1,057	)	$	8.34
Outstanding at December 31, 2017		12,834		$	9.54
Granted		866		$	31.64
Settled		(905	)	$	8.40
Forfeited		(443	)	$	16.22
Outstanding at December 31, 2018		12,352		$	10.93	6.1	$	126.2
Vested at December 31, 2018		11,095		$	9.18	5.8	$	124.3

Assumptions Used to Estimate Fair Value of Options Granted

The following assumptions were used to estimate the fair value of options and SARs granted during the years ended December 31, 2018, 2017 and 2016.

	2018			2017			2016
Assumptions:
Expected life of options (in years)		7.0-7.5			5.0 - 6.3			5.1
Risk-free interest rate		2.9% - 3.1	%		1.9 - 2.1	%		1.3	%
Assumed volatility		31.1% - 35.4	%		41.2 - 45.8	%		49.5	%
Expected dividend rate		0.0	%		0.0	%		0.0	%

Restricted Stock Unit Activity

A summary of the Company’s restricted stock unit activity for the year ended December 31, 2018 is presented in the following table (underlying shares in thousands).

	Shares			Weighted-Average Grant-Date Fair Value
Non-vested as of December 31, 2017		-		$	-
Granted		372		$	31.79
Vested		-		$	-
Forfeited		(10	)	$	32.06
Non-vested as of December 31, 2018		362		$	31.78